[Gate-users] Estimate randoms from ROOT-file

[COMTAT Claude]

Hi Ida,

Rather than estimating the random coincidences from the singles, you can simulate a delayed coincidence window within Gate in addition to the prompt coincidences, and use it to correct for random coincidences.  To add a delayed coincidence window, see the users guide:

"By default, the offset value is equal to 0, which corresponds to a prompt    coincidence sorter. If a delayed coincidence sorter, with 100 ns time shift, is to be simulated, one should specify the offset value with the command:
/gate/digitizer/Coincidences/setOffset 100. ns"

Claude

-----Message d'origine-----
De : gate-users-bounces at lists.opengatecollaboration.org [mailto:gate-users-bounces at lists.opengatecollaboration.org] De la part de Ida Häggström
Envoyé : jeudi 11 mars 2010 09:39
À : 
Objet : [Gate-users] Estimate randoms from ROOT-file

Hello!

I'm trying to create a randoms sinogram (not the "true randoms", but an
estimate) to use for randoms correction for later reconstruction in STIR.  I
guess the most common way is to use the singles countrates for each LOR (?).
I am not familiar with ROOT so I'm having some problems... Has anyone
managed to estimate the randoms from the ROOT output files? I would really
appreciate any help!

Thanks!
Ida
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